Bmw n54 st problems

[Ixn54e90]

Hey I have a 2007 bmw 335i e90 it has st kit, pi with 900cc injectors, full e-85, upgraded stage 3 lpfp, pr coils, etc im having a issue where it seems to be running really rich and it’ll break up around 5500rpms I have a map 5 log I’ll include below

The log just looks all crazy and all over the place

[ninjawaffulz]

I'm seeing bank to bank afr variance (a little), timing cut after gear shift, load reported should be much higher, ecu psi capping off at 17.1.


What BEF are you using?

[Ixn54e90]

im just using the bef st, pi, e-85 bin you find in the forums is there any updated bins i should be using?

its a i8A0S_st_e85_pi.bin

[Steve @ BMS/Fuel-It!]

Your AFR's are a bit wonky (typical ST issues) but you are not running rich. The log only goes to 5K rpms so it doesn't actually show the issue.

Low pressure looks to be struggling in the log.

[Ixn54e90]

I don’t know why the fuel pump is struggling it’s a stage 3 what do you think I should try

[Ixn54e90]

Is there any specific user adjustments I need for a st e85 pi tune or anything with the stage 3 lpfp?

does anyone know why the ecu psi is capping at 17?

[Steve @ BMS/Fuel-It!]

Your fueling with your current settings is fine. HPFP isn't struggling and trims are fine.

Verify your menu 4 setting is set to 2.

[Ixn54e90]

Yes it’s set to that for menu 4

[Ixn54e90]

I took a map 2 log to see if anything was different with that map here it is no break ups got up to 6200 on 3rd

[Steve @ BMS/Fuel-It!]

Hi,

It looks fine but why is your PID gain set to 35? It should be set to 25 and may cause you problems as you add more boost.

[Ixn54e90]

I haven’t touched that setting what difference will changing the pid gain make